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\name{MIextract}
\alias{MIextract}
%- Also NEED an '\alias' for EACH other topic documented here.
\title{Extract a parameter from a list of results }
\description{
Used to extract parameter estimates and standard errors from
lists produced by \code{\link{with.imputationList}}.
}
\usage{
MIextract(results, expr, fun)
}
%- maybe also 'usage' for other objects documented here.
\arguments{
\item{results}{A list of objects}
\item{expr}{an expression}
\item{fun}{a function of one argument}
}
\value{
A list
}
\details{
If \code{expr} is supplied, it is evaluated in each element of
\code{results}. Otherwise each element of \code{results} is passed as
an argument to \code{fun}.
}
\seealso{\code{\link{with.imputationList}}, \code{\link{MIcombine}}}
\examples{
data(smi)
models<-with(smi, glm(drinkreg~wave*sex,family=binomial()))
betas<-MIextract(models,fun=coef)
vars<-MIextract(models, fun=vcov)
summary(MIcombine(betas,vars))
}
\keyword{manip}% at least one, from doc/KEYWORDS
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